IFF

• Claude Iff (born 1946), Swiss footballer
• Simone Iff (1924-2014), French political activist

• Iff of the Unpronounceable Name, a character in The Riddle-Master trilogy by Patricia A. McKillip
• Simon Iff, a character by Aleister Crowley

• International film festival, a type of film festival

• Indonesian Film Festival, an annual film festival in Indonesia
• Ischia Film Festival, an annual film festival held on the island of Ischia, Italy

• Inferno, Flame, and Flint, a software by Autodesk Media and Entertainment
• "IFF", an episode of The Expanse

• Identification friend or foe, an electronic radio-based identification system for the military
• If and only if, a biconditional logical connective between statements, where either both statements are true or both are false
• Iff card, a smart card used on bus services in Cardiff, Wales, United Kingdom
• Interchange File Format, a computer file format

• International Fencing Federation (Fédération Internationale d'Escrime or FIE), the international governing body for fencing
• International Floorball Federation, the global governing body for the sport of floorball
• Irish Fencing Federation, the governing body for fencing in Ireland

• Iff Books, an imprint of John Hunt Publishing
• Independent Fianna Fáil, a political party in Ireland
• Institute For Figuring, an organization that promotes the public understanding of the poetic and aesthetic dimensions of science, mathematics and the technical arts
• International Federation of Factory Workers, former trade union international
• International Flavors & Fragrances, an American corporation which produces flavors and fragrances
• International Freedom Foundation, a self-described anti-communist group established in Washington, D.C.
• Fakultät für Interdisziplinäre Forschung und Fortbildung (Faculty for Interdisciplinary Research and Continuing Education), a faculty of the Austrian University of Klagenfurt

• Illicit financial flows, a concept in economics and finance related to resources that are of illegal origin, use or transfer
• International Finance Facility, proposed by HM Treasury in conjunction with the Department for International Development of the United Kingdom
• International freight forwarder, an individual or company that books or otherwise arranges space for shipments between countries via common carriers
• Utaha language (ISO 639 language code iff), also known as Ifo, an extinct language from Erromango, Vanuatu

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• {{lookfrom|Iff}}
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• If (disambiguation)
• IIF (disambiguation)
• Iffs

• IF2

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